carrier protein

https://doi.org/10.1351/goldbook.CT06814
  1. Protein to which a specific ligand or @[email protected] is conjugated.
  2. Unlabeled protein introduced into an @[email protected] at relatively high concentrations which distributes in a fractionation process in the same manner as labeled protein analyte, present in very low concentrations.
  3. Protein added to prevent non-specific interaction of reagents with surfaces, sample components, and each other.
  4. Protein found in cell membranes, which facilitates transport of a ligand across the @[email protected]
Source:
PAC, 2004, 76, 1033. (Glossary of terms used in toxicokinetics (IUPAC Recommendations 2003)) on page 1043 [Terms] [Paper]